Sure, let me google that for you.

ethicalconsumer.org/…/history-successful-boycotts

In general boycotts are less about driving a company to bankruptcy and more about getting them to change their behavior. Some companies are surprisingly immune to boycotts but many others have walked back their problematic behavior. Notably in recent memory in the US I can think of Barilla, Chick-fil-a and (by conservatives) Budweiser. The Montgomery bus line boycott is the stuff of history.